Hello all!
For those of you interested, here is the assembled RevA board
Finally I got to test the RS232 port today. It works great!
So it all works great!

For those of you interested, here are the specs:
8 x 0-30 VDC inputs
4 x 0-5 VDC or 0-3.3 VDC (with analog reference of 3.3v)
Each of the 4 ports above has 3.3vdc supply and ground - for easy connection to temperature or pressure sensors
1 x RS232 port for NMEA0183
1 x NMEA2000 port with MICRO-C male connector (or just bare wires if preferred)
external 12-18VDC power or N2K bus powered - jumper selectable.
I'm planning to make RevB based on feedback I get from the forum and few things that I feel I can improve.
Please let me know what you think should be added or substracted from the board. I prefer to keep it simple and have multiple boards for more interfaces.
This boat was tested with Timo's multi device interface with up to 5 devices.
I simulated:
Heading
Fluid levels
Rudder indicator
Compass
Battery
Please let me know if you have any other uses that I can implement the hardware for.
Cheers!